What is the reason for the headlights not working and the horn not sounding?

[StAvery]

Car headlights not working and horn not sounding reasons and solutions are as follows: The reason for car headlights not working and horn not sounding: If the car's lights and horn are both not working or sounding, it is generally due to a blown fuse or a damaged converter. The solution for car headlights not working and horn not sounding: Check if the converter's fuse is blown. If the fuse is not blown, use a multimeter to measure the converter's output voltage. If there is a 12v output, if it exceeds or there is no output, it proves the converter is damaged, and it only needs to be replaced. After replacement, if you find that the headlights can be turned on but the horn does not sound or the sound is weak, it may be due to a ground wire break, and you need to locate and reconnect the broken position.